Clavulanic acid is a β-lactam drug that functions as a mechanism-based β-lactamase inhibitor. While not effective by itself as an antibiotic, when combined with penicillin-group antibiotics, it can overcome antibiotic resistance in bacteria that secrete β + some more technical info. It irreversibly acylates the active-site serine of many class A β-lactamases and forms a stable covalent adduct that prevents hydrolysis of co-administered penicillins; it shows activity against a broad range of plasmid-encoded TEM and SHV enzymes and some chromosomal class C enzymes but has limited effect on metallo-β-lactamases. The molecule is a bicyclic oxazolidine-fused β-lactam that is chemically labile to alkaline hydrolysis and to ring opening; in formulations it is typically delivered as potassium clavulanate or in fixed-dose combinations with amoxicillin to restore or extend in vivo antibacterial spectrum. Pharmacokinetic considerations include rapid oral absorption, moderate protein binding, and hepatic metabolism with urinary excretion of metabolites.
Parent: Clavulanic Acid
Parent: Clavulanic Acid
Clavulanic acid and its salts are prone to specific degradation and related substances that are controlled in the API and finished product specifications. Common related compounds and degradation products include epimers and stereoisomers, the open-ring hydrolysis product (beta-lactam ring-opened clavulanic acid), decarboxylated or oxidized derivatives, and residual counterions such as potassium in potassium clavulanate. Typical compendial and manufacturer limits are expressed as percent relative to the active substance; practical control ranges used in industry are individual identified related substances commonly limited to 0.1 to 1.0 percent each, with many monographs and manufacturers setting acceptance at not more than 0.5 percent for a single known impurity, and a total related-substance limit usually between 1.0 and 2.0 percent. Specific impurity limits can vary by pharmacopeial monograph and regulatory filing, so batch release testing usually reports each identified impurity and a summed total, with tighter limits applied to genotoxic or unknown impurities.
Clavulanic acid is used as a β-lactamase inhibitor given in combination with penicillin-group antibiotics, most commonly amoxicillin, to treat bacterial infections caused by organisms that produce β-lactamase enzymes which would otherwise inactivate the antibiotic.
Yes, allergic reactions to clavulanic acid can occur though many hypersensitivity events associated with combination drugs are due to the penicillin component; true isolated allergy to clavulanic acid is uncommon but can present with rash, angioedema, or anaphylaxis so prior penicillin or clavulanate allergy should be evaluated before use.
Clavulanic acid inhibits β-lactamase enzymes produced by resistant bacteria, protecting amoxicillin from enzymatic degradation and thereby restoring or extending amoxicillin’s antibacterial activity against β-lactamase-producing strains.
Amoxicillin is a single-agent penicillin antibiotic; AMOX CLAV refers to a fixed-dose combination of amoxicillin plus clavulanic acid (clavulanate), where clavulanic acid serves only to inhibit β-lactamases and broaden the effective spectrum of amoxicillin.
